GB1120370A - Crosslinked polyolefins and their production - Google Patents

Abstract

Curable compositions comprise 100 parts by weight of polymeric material containing at least 50 weight per cent of repeating units derived from an a -olefin, and 0.1 to 30 parts by weight of a diester of a dioxime in which the nitrogen atoms are connected by a chain of conjugated unsaturated carbon atoms and represented by the formula <FORM:1120370/C3/1> wherein A is an acyl, aroyl, alkylsulphonyl, arylsulphonyl, alkylphosphinyl, arylphosphinyl, alkylsulphinyl, arylsulphinyl, alkylcarbamyl or aryl carbamyl group containing 1 to 36 carbon atoms, R is hydrogen, halogen, alkyl, aryl, alkaryl, aralkyl, nitro or -C(R1)=N-OA, where R1 is hydrogen, halogen, alkyl, aryl, alkaryl, aralkyl or nitro, and m, n and o are 0, 1 or 2. Specified polymers are polyethylene, polypropylene, ethylene/propylene copolymers, ethylene / butylene copolymers, butyl rubber, ethylene / propylene / diene terpolymers, ethylene/vinyl acetate copolymers and oxidized, chlorinated and chlorosulphonated polyethylene. Accelerators, e.g. halides, chelates and coordination complexes of metals and boron; plasticizers; extending oils; antistatic agents; antioxidants; pigments and fillers, e.g. carbon black, clay, silica, alumina, diatomaceous earth, talc, kaolin, and metal oxides, hydroxides, carbonates, silicates and sulphates; may also be present and the compositions formed into shaped articles and cured. Many oxime esters and accelerators are listed and examples describe curable compositions comprising ethylene/propylene rubbers and (4) glyoxime distearate together with (5) ferric acetylacetonate, (6) furil dioxime distearate, (7) glyoxime dibenzoate, (8) dimethyl glyoxime dibenzoate, (9) quinone dioxime dibenzene sulphonate and (10) terephthalaldehyde dioxime distearate with and without ferric acetylacetonate; an isobutylene/butadiene copolymer and (11) glyoxime distearate; polyethylene and (12) dimethyl glyoxime distearate; and oxidized polyethylene and (13) dimethyl glyoxime distearate.ALSO:Diesters of dioximes of formula <FORM:1120370/C2/1> where A is acyl, aroyl, alkylsulphonyl, arylsulphonyl, alkylphosphinyl, arylphosphinyl, alkylsulphinyl, arylsulphinyl, alkylcarbamyl or arylcarbamyl containing 1 to 36 carbon atoms, R is hydrogen, halogen, alkyl, aryl, alkaryl, aralkyl, nitro or -C(R1) = NOA where R1 is hydrogen, halogen, alkyl, aryl, alkaryl, aralkyl or nitro and m, n and o are 0, 1 or 2, may be prepared by reacting the dioximes with the acid chlorides in pyridine. Examples describe the reaction of (1) glyoxime and stearoyl chloride, (2) furil dioxime and stearoyl chloride, and (3) terephthalaldehyde and hydroxylamine followed by stearoyl chloride; and properties of furil dioxime distearate, 1-phenyl-1,2-propanedione dioxime distearate, terephthalaldehyde dioxime distearate, glyoxime and dimethylglyoxime distearates and dibenzoates and diphenyl glyoxime distearate are tabulated.